CN103236631A - Active Q-switching single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium - Google Patents
Active Q-switching single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium Download PDFInfo
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- CN103236631A CN103236631A CN2013101604540A CN201310160454A CN103236631A CN 103236631 A CN103236631 A CN 103236631A CN 2013101604540 A CN2013101604540 A CN 2013101604540A CN 201310160454 A CN201310160454 A CN 201310160454A CN 103236631 A CN103236631 A CN 103236631A
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Abstract
The invention discloses an active Q-switching single-frequency optical fiber laser using a rare earth-doped quartz optical fiber as a gain medium, and the laser is characterized in that the output tail fiber of a pumping semiconductor laser 1 is connected to the pumping input port of an optical fiber beam combiner 2; the output optical fiber port of the optical fiber beam combiner is connected with a high-reflectivity optical fiber bragg grating 3; the other end of the high-reflectivity optical fiber bragg grating 3 is welded with the rare earth-doped quartz optical fiber 4; the other end of the rare earth-doped quartz optical fiber 4 is welded with a low-reflectivity optical fiber bragg grating 7 which is written on a polarization-maintaining optical fiber to form a resonant cavity; a piezoelectric element 5 is driven by a modulation signal driving circuit thereof to periodically press a non-polarization-maintaining optical fiber in the resonant cavity so as to modulate the polarization direction of light; the low-reflectivity optical fiber bragg grating 7 is welded with an output optical fiber 8 to lead the single-frequency pulse laser to be output; and in such a manner, the adjustable repetition frequency of laser pulse and uniform width range of pulse width are realized, the size of the whole system is compact, and the performance is stable.
Description
Technical field
The present invention relates to a kind of fiber laser, especially a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, belong to optical fiber and laser technology field.
Background technology
Fiber laser is that the optical fiber with doped with rare-earth elements is the laser of gain media, by the different rare earth element that mixes, as bait (Er), an an ancient unit of weight equal to 20 or 24 *taels of silver (Yb), thulium (Tm), holmium (Ho), neodymium (Nd) etc., the service band of fiber laser covered from ultraviolet to infrared.Compare with other lasers, it is low that fiber laser has the laser work threshold value, the energy transformation ratio height, output beam quality is good, compact conformation is stablized, need not the light path adjustment, perfect heat-dissipating, the life-span is long and distinguishing feature such as Maintenance free, therefore is rapidly developed and uses widely.
Advantages such as single frequency optical fiber laser possesses outside the general advantage of fiber laser, and it is long also to possess coherence length simultaneously, and monochromaticjty is good, and breadth of spectrum line is narrow, these characteristics make it be widely used in remote sensing, radar, range finding, spectroscopy, fields such as nonlinear optics.Especially the single frequency optical fiber laser of impulse type because high peak power and pulse energy can be provided, can satisfy application demand widely.Obtain a kind of easily, the SF pulse optical fibre laser of stable performance has important practical significance.
Summary of the invention
The present invention has realized a kind of piezoelectric element that utilizes easily, and rear-earth-doped silica fiber obtains the method for single-frequency optical-fiber laser pulse, and the equal wide region of the repetition rate of laser pulse and pulse duration is adjustable, whole system compact dimensions, working stability.
The present invention is realized by the following technical programs.
A kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, comprise pumping semiconductor laser 1, it is characterized in that the output tail optical fiber of pumping semiconductor laser 1 is connected in the pumping input port of optical-fiber bundling device 2, the output optical fibre port of optical-fiber bundling device connects high reflectance Fiber Bragg Grating FBG 3, the other end of high reflectance Fiber Bragg Grating FBG 3 and rear-earth-doped silica fiber 4 weld together, the other end of rear-earth-doped silica fiber 4 then with write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and weld together and form resonant cavity, piezoelectric element 5 is periodically pressed in the resonant cavity non-polarization maintaining optical fibre with the polarization direction of light modulated under the driving of its modulation signal drive circuit 6, antiradar reflectivity Fiber Bragg Grating FBG 7 and output optical fibre 8 welding guiding laser outputs.
Rear-earth-doped silica fiber 4 of the present invention is that doped with rare-earth elements can be bait (Er), can be ytterbium (Yb), can be thulium (Tm), can be holmium (Ho), also can be other rare earth elements, by the absorption of highly doped realization to pump light 6-10dB/cm.
High reflectance Fiber Bragg Grating FBG of the present invention 3 and write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and form laser mirrors or claim laser cavity.
Output laser pulse of the present invention is single-frequency laser, and the output of single-frequency laser realizes that by control laser cavity chamber is long the laser cavity chamber is long:
L=
L Gain fibre+
L High reflective grid tail optical fiber+
L Low reflective grid tail optical fiber
Output laser pulse of the present invention is single-frequency laser, and the output of single-frequency laser is that each longitudinal mode spacing guarantees laser single longitudinal mode (single-frequency) output, longitudinal mode spacing in the laser cavity by regulating
Wherein
cBe light wave propagation velocity in a vacuum,
nBe the refractive index of fiber core,
LBe that the laser cavity chamber is long, use highly doped gain fibre to reduce its length, reduce grating tail optical fiber length simultaneously, control laser cavity chamber length short as far as possible, thereby strengthened each longitudinal mode spacing in the chamber, can guarantee laser single longitudinal mode (single-frequency) output.
Output laser pulse of the present invention is single-frequency laser, antiradar reflectivity Fiber Bragg Grating FBG 7 realizations that are formed on the polarization maintaining optical fibre by using the arrowband to write, and the reflectance spectrum bandwidth need be controlled at several GHz, generally needs control not cross 0.05 nanometer.
The antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre of writing of the present invention is write and is formed on the polarization maintaining optical fibre, and two reflection peaks (corresponding respectively to the fast and slow axis polarization mode) are arranged.
The invention has the advantages that it has realized a kind of simple and easy single-frequency optical-fiber laser pulse of obtaining, simple in structure, stable performance, the single-frequency laser pulse repetition frequency of output and pulse duration all can be regulated by wide region.
Description of drawings
Fig. 1 is the structure chart that the present invention initiatively transfers the Q single frequency optical fiber laser
Fig. 2 is the typical light pulse that the present invention initiatively transfers the output of Q single frequency optical fiber laser
Fig. 3. be the typical light pulse train that the present invention initiatively transfers the output of Q single frequency optical fiber laser
Mark among the figure: pumping semiconductor laser 1, optical-fiber bundling device 2, high reflectance Fiber Bragg Grating FBG 3, rear-earth-doped silica fiber 4, piezoelectric element 5, piezoelectric element modulation signal drive circuit 6, write the antiradar reflectivity Fiber Bragg Grating FBG 7, the output optical fibre 8 that are formed on the polarization maintaining optical fibre.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, what a kind of rear-earth-doped silica fiber was made gain media initiatively transfers the Q single frequency optical fiber laser, comprise pumping semiconductor laser 1, its output tail optical fiber is connected in the pumping input port of optical-fiber bundling device 2, the output optical fibre port of optical-fiber bundling device 2 connects high reflectance Fiber Bragg Grating FBG 3, the other end of high reflectance Fiber Bragg Grating FBG 3 and rear-earth-doped silicon optical fiber 4 weld together, the other end of rear-earth-doped silicon optical fiber 4 then with write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and weld together, high reflectance Fiber Bragg Grating FBG 3, rear-earth-doped silicon optical fiber 4 and write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and form resonant cavitys, piezoelectric element 5 is periodically pressed in the resonant cavity non-polarization maintaining optical fibre with the polarization direction of light modulated under the driving of its modulation signal drive circuit 6, grating 7 and output optical fibre 8 welding guiding laser outputs.
What the rear-earth-doped silica fiber of described use was made gain media initiatively transfers the Q single frequency optical fiber laser, gain fibre is highly doped rear-earth-doped silica fiber, rare earth element can be bait (Er), can be ytterbium (Yb), can be thulium (Tm), can be holmium (Ho), also can be other rare earth elements, by the absorption of highly doped realization to pump light 6-10dB/cm.
The antiradar reflectivity Fiber Bragg Grating FBG that described high reflectance Fiber Bragg Grating FBG and writing is formed on the polarization maintaining optical fibre is formed laser cavity.Wherein, the high reflectance Fiber Bragg Grating FBG is write and is formed on the non-polarization maintaining optical fibre, the reflection peak (such as 0.3nm) that a broader bandwidth is arranged, writing the antiradar reflectivity Fiber Bragg Grating FBG that is formed on the polarization maintaining optical fibre writes and is formed on the polarization maintaining optical fibre, two reflection peaks are arranged, respectively corresponding two polarization modes, these two reflection peaks have only the reflection peak with the high reflectance Fiber Bragg Grating FBG corresponding, this moment, the Q value of laser cavity just formed certain contacting with the polarization direction of laser, control signal drive circuit is used for driving piezoelectric element 5 and presses periodically that thereby gain fibre comes the Q value of polarisation of light direction periodic modulation laser cavity in the periodic adjustment chamber with this in the resonant cavity, make the Q value periodically satisfy laser concussion condition, form laser pulse, Fig. 2, Fig. 3 have described typical pulse and the pulse train that ytterbium is initiatively transferred the output of Q single frequency laser of mixing of our developments respectively.
It is single-frequency laser that the present invention exports laser, and the output of single-frequency laser is to control laser single longitudinal mode (single-frequency) output by the long L in chamber that controls laser cavity,
L=
L Gain fibre+
L High reflective grid tail optical fiber+
L Low reflective grid tail optical fiber.
It is single-frequency laser that the present invention exports laser, and the output of single-frequency laser is that each longitudinal mode spacing guarantees laser single longitudinal mode (single-frequency) output, longitudinal mode spacing in the laser cavity by regulating
Wherein
cBe light wave propagation velocity in a vacuum,
nBe the refractive index of fiber core,
LBe that the laser cavity chamber is long, use highly doped gain fibre to reduce its length, reduce grating tail optical fiber length simultaneously, control laser cavity chamber length short as far as possible, thereby strengthened each longitudinal mode spacing in the chamber, can guarantee laser single longitudinal mode (single-frequency) output.
It is single-frequency laser that the present invention exports laser, antiradar reflectivity Fiber Bragg Grating FBG 5 realizations that are formed on the polarization maintaining optical fibre by using the arrowband to write, and the reflectance spectrum bandwidth need be controlled at several GHz, generally needs control not cross 0.05 nanometer.
Claims (7)
- One kind use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, comprise pumping semiconductor laser 1, optical-fiber bundling device 2, high reflectance Fiber Bragg Grating FBG 3, rear-earth-doped silica fiber 4, piezoelectric element 5, piezoelectric element modulation signal drive circuit 6, write the antiradar reflectivity Fiber Bragg Grating FBG 7 and the output optical fibre 8 that are formed on the polarization maintaining optical fibre, it is characterized in that the output tail optical fiber of pumping semiconductor laser 1 is connected in the pumping input port of optical-fiber bundling device 2, the output optical fibre port of optical-fiber bundling device connects high reflectance Fiber Bragg Grating FBG 3, the other end of high reflectance Fiber Bragg Grating FBG 3 and rear-earth-doped silica fiber 4 weld together, the other end of rear-earth-doped silica fiber 4 then with write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and be welded together to form resonant cavity, piezoelectric element 5 is periodically pressed in the resonant cavity non-polarization maintaining optical fibre with the polarization direction of light modulated under the driving of its modulation signal drive circuit 6, write the antiradar reflectivity Fiber Bragg Grating FBG 7 and output optical fibre 8 welding guiding pure-tone pulse laser outputs that are formed on the polarization maintaining optical fibre.
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, it is characterized in that rear-earth-doped silica fiber 4 is that doping is bait (Er) or ytterbium (Yb) or thulium (Tm) or holmium (Ho), by the absorption of highly doped realization to pump light 6-10dB/cm.
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, it is characterized in that by described high reflectance Fiber Bragg Grating FBG 3 and write the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and form laser cavity.
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, the output that it is characterized in that single-frequency laser is to control single longitudinal mode output by control laser cavity chamber length, the laser cavity chamber is long: L= L Gain fibre+ L High reflective grid tail optical fiber+ L Low reflective grid tail optical fiber
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, the output that it is characterized in that single-frequency laser is that each longitudinal mode spacing guarantees the output of laser single longitudinal mode, longitudinal mode spacing in the laser cavity by regulating , wherein cBe light wave propagation velocity in a vacuum, nBe the refractive index of fiber core, LBe that the laser cavity chamber is long.
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, it is characterized in that writing the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and adopt the narrowband reflection spectrum, the reflectance spectrum bandwidth need be controlled and not cross 0.05 nanometer.
- According to claim 1 a kind of use that rear-earth-doped silica fiber makes gain media initiatively transfer the Q single frequency optical fiber laser, it is characterized in that writing the antiradar reflectivity Fiber Bragg Grating FBG 7 that is formed on the polarization maintaining optical fibre and write and be formed on the polarization maintaining optical fibre, have two to correspond respectively to fast and slow axis polarization mode reflection peak.
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| CN2013101604540A CN103236631A (en) | 2013-05-05 | 2013-05-05 | Active Q-switching single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532000A (en) * | 2013-10-11 | 2014-01-22 | 山东海富光子科技股份有限公司 | Novel single-frequency pulse ultraviolet light source on basis of 978nm single-frequency pulse optical fiber laser |
| CN104300347A (en) * | 2014-10-27 | 2015-01-21 | 山东大学 | Linear polarization Yb-doped double-cladding all fiber laser device with selectable polarization state and work method thereof |
| CN104466649A (en) * | 2014-12-15 | 2015-03-25 | 山东海富光子科技股份有限公司 | Mode-hop-free fast wavelength modulation single frequency fiber laser |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856784A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | Linear-cavity active Q-switching all-fiber laser |
| CN103050874A (en) * | 2013-01-16 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type singe-frequency all-fiber laser system |
-
2013
- 2013-05-05 CN CN2013101604540A patent/CN103236631A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856784A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | Linear-cavity active Q-switching all-fiber laser |
| CN103050874A (en) * | 2013-01-16 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type singe-frequency all-fiber laser system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532000A (en) * | 2013-10-11 | 2014-01-22 | 山东海富光子科技股份有限公司 | Novel single-frequency pulse ultraviolet light source on basis of 978nm single-frequency pulse optical fiber laser |
| CN104300347A (en) * | 2014-10-27 | 2015-01-21 | 山东大学 | Linear polarization Yb-doped double-cladding all fiber laser device with selectable polarization state and work method thereof |
| CN104466649A (en) * | 2014-12-15 | 2015-03-25 | 山东海富光子科技股份有限公司 | Mode-hop-free fast wavelength modulation single frequency fiber laser |
| CN104466649B (en) * | 2014-12-15 | 2023-07-18 | 山东海富光子科技股份有限公司 | Mode-jump-free fast wavelength modulation single-frequency optical fiber laser |
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Application publication date: 20130807 |